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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: Util.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Function;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterables;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.google.common.reflect.TypeToken;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.lang.annotation.Annotation;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.lang.reflect.AnnotatedElement;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.lang.reflect.InvocationTargetException;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.lang.reflect.Method;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.lang.reflect.Modifier;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.lang.reflect.ParameterizedType;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.lang.reflect.Type;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.lang.reflect.TypeVariable;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.lang.reflect.WildcardType;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Arrays;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.HashSet;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Iterator;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Set;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.regex.Matcher;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.regex.Pattern;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>import javax.validation.Constraint;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.jsimpledb.annotation.Validate;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>/**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * Various utility routines.<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span>public final class Util {<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    private static final WildcardType QUESTION_MARK = new WildcardType() {<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>        @Override<a name="line.41"></a>
<span class="sourceLineNo">042</span>        public Type[] getUpperBounds() {<a name="line.42"></a>
<span class="sourceLineNo">043</span>            return new Type[] { Object.class };<a name="line.43"></a>
<span class="sourceLineNo">044</span>        }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>        @Override<a name="line.46"></a>
<span class="sourceLineNo">047</span>        public Type[] getLowerBounds() {<a name="line.47"></a>
<span class="sourceLineNo">048</span>            return new Type[0];<a name="line.48"></a>
<span class="sourceLineNo">049</span>        }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>        @Override<a name="line.51"></a>
<span class="sourceLineNo">052</span>        public String toString() {<a name="line.52"></a>
<span class="sourceLineNo">053</span>            return "?";<a name="line.53"></a>
<span class="sourceLineNo">054</span>        }<a name="line.54"></a>
<span class="sourceLineNo">055</span>    };<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    private static Method newParameterizedTypeMethod;<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>    private Util() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>    }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    /**<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * Determine if instances of the given type require any validation.<a name="line.63"></a>
<span class="sourceLineNo">064</span>     *<a name="line.64"></a>
<span class="sourceLineNo">065</span>     * &lt;p&gt;<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * This will be true if {@code type} or any of its declared methods has a JSR 303 (&lt;i&gt;public&lt;/i&gt; methods only)<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * or {@link Validate &amp;#64;Validate} annotation, or if any of its super-types requires validation.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * &lt;/p&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @param type object type<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @return true if {@code type} has any validation requirements<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * @throws IllegalArgumentException if {@code type} is null<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @see ValidationMode<a name="line.73"></a>
<span class="sourceLineNo">074</span>     */<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public static boolean requiresValidation(Class&lt;?&gt; type) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        if (type == null)<a name="line.76"></a>
<span class="sourceLineNo">077</span>            throw new IllegalArgumentException("null type");<a name="line.77"></a>
<span class="sourceLineNo">078</span>        if (Util.hasValidationAnnotation(type))<a name="line.78"></a>
<span class="sourceLineNo">079</span>            return true;<a name="line.79"></a>
<span class="sourceLineNo">080</span>        for (Method method : type.getDeclaredMethods()) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>            if (method.isAnnotationPresent(Validate.class)<a name="line.81"></a>
<span class="sourceLineNo">082</span>              || ((method.getModifiers() &amp; Modifier.PUBLIC) != 0 &amp;&amp; Util.hasValidationAnnotation(method)))<a name="line.82"></a>
<span class="sourceLineNo">083</span>                return true;<a name="line.83"></a>
<span class="sourceLineNo">084</span>        }<a name="line.84"></a>
<span class="sourceLineNo">085</span>        for (TypeToken&lt;?&gt; typeToken : TypeToken.of(type).getTypes()) {<a name="line.85"></a>
<span class="sourceLineNo">086</span>            final Class&lt;?&gt; superType = typeToken.getRawType();<a name="line.86"></a>
<span class="sourceLineNo">087</span>            if (superType != type &amp;&amp; Util.requiresValidation(superType))<a name="line.87"></a>
<span class="sourceLineNo">088</span>                return true;<a name="line.88"></a>
<span class="sourceLineNo">089</span>        }<a name="line.89"></a>
<span class="sourceLineNo">090</span>        return false;<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    /**<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * Determine if the given getter method, or any method it overrides, has a JSR 303 validation constraint.<a name="line.94"></a>
<span class="sourceLineNo">095</span>     *<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @param method annotated method<a name="line.96"></a>
<span class="sourceLineNo">097</span>     * @return true if {@code obj} has one or more JSR 303 annotations<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * @throws IllegalArgumentException if {@code method} is null<a name="line.98"></a>
<span class="sourceLineNo">099</span>     */<a name="line.99"></a>
<span class="sourceLineNo">100</span>    public static boolean requiresValidation(Method method) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>        if (method == null)<a name="line.101"></a>
<span class="sourceLineNo">102</span>            throw new IllegalArgumentException("null method");<a name="line.102"></a>
<span class="sourceLineNo">103</span>        for (TypeToken&lt;?&gt; typeToken : TypeToken.of(method.getDeclaringClass()).getTypes()) {<a name="line.103"></a>
<span class="sourceLineNo">104</span>            final Class&lt;?&gt; superType = typeToken.getRawType();<a name="line.104"></a>
<span class="sourceLineNo">105</span>            try {<a name="line.105"></a>
<span class="sourceLineNo">106</span>                method = superType.getMethod(method.getName(), method.getParameterTypes());<a name="line.106"></a>
<span class="sourceLineNo">107</span>            } catch (NoSuchMethodException e) {<a name="line.107"></a>
<span class="sourceLineNo">108</span>                continue;<a name="line.108"></a>
<span class="sourceLineNo">109</span>            }<a name="line.109"></a>
<span class="sourceLineNo">110</span>            if (Util.hasValidationAnnotation(method))<a name="line.110"></a>
<span class="sourceLineNo">111</span>                return true;<a name="line.111"></a>
<span class="sourceLineNo">112</span>        }<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return false;<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    /**<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * Determine whether the given object has any JSR 303 annotation(s).<a name="line.117"></a>
<span class="sourceLineNo">118</span>     *<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * @param obj annotated element<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * @return true if {@code obj} has one or more JSR 303 annotations<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * @throws IllegalArgumentException if {@code obj} is null<a name="line.121"></a>
<span class="sourceLineNo">122</span>     */<a name="line.122"></a>
<span class="sourceLineNo">123</span>    public static boolean hasValidationAnnotation(AnnotatedElement obj) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>        if (obj == null)<a name="line.124"></a>
<span class="sourceLineNo">125</span>            throw new IllegalArgumentException("null obj");<a name="line.125"></a>
<span class="sourceLineNo">126</span>        for (Annotation annotation : obj.getAnnotations()) {<a name="line.126"></a>
<span class="sourceLineNo">127</span>            final Class&lt;?&gt; annotationType = annotation.annotationType();<a name="line.127"></a>
<span class="sourceLineNo">128</span>            if (annotationType.isAnnotationPresent(Constraint.class))<a name="line.128"></a>
<span class="sourceLineNo">129</span>                return true;<a name="line.129"></a>
<span class="sourceLineNo">130</span>        }<a name="line.130"></a>
<span class="sourceLineNo">131</span>        return false;<a name="line.131"></a>
<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>    /**<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * Find the setter method corresponding to a getter method.<a name="line.135"></a>
<span class="sourceLineNo">136</span>     *<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * @param type Java type (possibly a sub-type of the type in which {@code getter} is declared)<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * @param getter Java bean property getter method<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * @return Java bean property setter method<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * @throws IllegalArgumentException if no corresponding setter method exists<a name="line.140"></a>
<span class="sourceLineNo">141</span>     */<a name="line.141"></a>
<span class="sourceLineNo">142</span>    public static Method findSetterMethod(Class&lt;?&gt; type, Method getter) {<a name="line.142"></a>
<span class="sourceLineNo">143</span>        final Matcher matcher = Pattern.compile("(is|get)(.+)").matcher(getter.getName());<a name="line.143"></a>
<span class="sourceLineNo">144</span>        if (!matcher.matches()) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>            throw new IllegalArgumentException("can't infer setter method name from getter method "<a name="line.145"></a>
<span class="sourceLineNo">146</span>              + getter.getName() + "() because name does not follow Java bean naming conventions");<a name="line.146"></a>
<span class="sourceLineNo">147</span>        }<a name="line.147"></a>
<span class="sourceLineNo">148</span>        final String setterName = "set" + matcher.group(2);<a name="line.148"></a>
<span class="sourceLineNo">149</span>        for (TypeToken&lt;?&gt; superType : TypeToken.of(type).getTypes()) {<a name="line.149"></a>
<span class="sourceLineNo">150</span>            try {<a name="line.150"></a>
<span class="sourceLineNo">151</span>                final Method setter = superType.getRawType().getMethod(setterName, getter.getReturnType());<a name="line.151"></a>
<span class="sourceLineNo">152</span>                if (setter.getReturnType() != Void.TYPE)<a name="line.152"></a>
<span class="sourceLineNo">153</span>                    continue;<a name="line.153"></a>
<span class="sourceLineNo">154</span>                return setter;<a name="line.154"></a>
<span class="sourceLineNo">155</span>            } catch (NoSuchMethodException e) {<a name="line.155"></a>
<span class="sourceLineNo">156</span>                continue;<a name="line.156"></a>
<span class="sourceLineNo">157</span>            }<a name="line.157"></a>
<span class="sourceLineNo">158</span>        }<a name="line.158"></a>
<span class="sourceLineNo">159</span>        throw new IllegalArgumentException("can't find any setter method " + setterName<a name="line.159"></a>
<span class="sourceLineNo">160</span>          + "() corresponding to getter method " + getter.getName() + "() taking " + getter.getReturnType()<a name="line.160"></a>
<span class="sourceLineNo">161</span>          + " and returning void");<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /**<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * Find the narrowest type that is a supertype of all of the given types.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     *<a name="line.166"></a>
<span class="sourceLineNo">167</span>     * &lt;p&gt;<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * This method delegates to {@link #findLowestCommonAncestor findLowestCommonAncestor()}<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * after converting the {@link Class} instances to {@link TypeToken}s.<a name="line.169"></a>
<span class="sourceLineNo">170</span>     * &lt;/p&gt;<a name="line.170"></a>
<span class="sourceLineNo">171</span>     *<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * @param types sub-types<a name="line.172"></a>
<span class="sourceLineNo">173</span>     * @return narrowest common super-type<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * @see #findLowestCommonAncestor findLowestCommonAncestor()<a name="line.174"></a>
<span class="sourceLineNo">175</span>     */<a name="line.175"></a>
<span class="sourceLineNo">176</span>    public static TypeToken&lt;?&gt; findLowestCommonAncestorOfClasses(Iterable&lt;Class&lt;?&gt;&gt; types) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>        return Util.findLowestCommonAncestor(Iterables.transform(types, new Function&lt;Class&lt;?&gt;, TypeToken&lt;?&gt;&gt;() {<a name="line.177"></a>
<span class="sourceLineNo">178</span>            @Override<a name="line.178"></a>
<span class="sourceLineNo">179</span>            public TypeToken&lt;?&gt; apply(Class&lt;?&gt; type) {<a name="line.179"></a>
<span class="sourceLineNo">180</span>                return TypeToken.of(type);<a name="line.180"></a>
<span class="sourceLineNo">181</span>            }<a name="line.181"></a>
<span class="sourceLineNo">182</span>        }));<a name="line.182"></a>
<span class="sourceLineNo">183</span>    }<a name="line.183"></a>
<span class="sourceLineNo">184</span><a name="line.184"></a>
<span class="sourceLineNo">185</span>    /**<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * Find the narrowest type that is a supertype of all of the given types.<a name="line.186"></a>
<span class="sourceLineNo">187</span>     *<a name="line.187"></a>
<span class="sourceLineNo">188</span>     * &lt;p&gt;<a name="line.188"></a>
<span class="sourceLineNo">189</span>     * When there is more than one choice, heuristics are used. For example, we prefer<a name="line.189"></a>
<span class="sourceLineNo">190</span>     * non-interface types, and {@link JObject} over other interface types.<a name="line.190"></a>
<span class="sourceLineNo">191</span>     * &lt;/p&gt;<a name="line.191"></a>
<span class="sourceLineNo">192</span>     *<a name="line.192"></a>
<span class="sourceLineNo">193</span>     * @param types sub-types<a name="line.193"></a>
<span class="sourceLineNo">194</span>     * @return narrowest common super-type<a name="line.194"></a>
<span class="sourceLineNo">195</span>     */<a name="line.195"></a>
<span class="sourceLineNo">196</span>    public static TypeToken&lt;?&gt; findLowestCommonAncestor(Iterable&lt;TypeToken&lt;?&gt;&gt; types) {<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>        // Gather all supertypes of types recursively<a name="line.198"></a>
<span class="sourceLineNo">199</span>        final HashSet&lt;TypeToken&lt;?&gt;&gt; supertypes = new HashSet&lt;&gt;();<a name="line.199"></a>
<span class="sourceLineNo">200</span>        for (TypeToken&lt;?&gt; type : types)<a name="line.200"></a>
<span class="sourceLineNo">201</span>            Util.addSupertypes(supertypes, type);<a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span>        // Throw out all supertypes that are not supertypes of every type<a name="line.203"></a>
<span class="sourceLineNo">204</span>        for (Iterator&lt;TypeToken&lt;?&gt;&gt; i = supertypes.iterator(); i.hasNext(); ) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>            final TypeToken&lt;?&gt; supertype = i.next();<a name="line.205"></a>
<span class="sourceLineNo">206</span>            for (TypeToken&lt;?&gt; type : types) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>                if (!supertype.isAssignableFrom(type)) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>                    i.remove();<a name="line.208"></a>
<span class="sourceLineNo">209</span>                    break;<a name="line.209"></a>
<span class="sourceLineNo">210</span>                }<a name="line.210"></a>
<span class="sourceLineNo">211</span>            }<a name="line.211"></a>
<span class="sourceLineNo">212</span>        }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>        // Throw out all supertypes that are supertypes of some other supertype<a name="line.214"></a>
<span class="sourceLineNo">215</span>        for (Iterator&lt;TypeToken&lt;?&gt;&gt; i = supertypes.iterator(); i.hasNext(); ) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>            final TypeToken&lt;?&gt; supertype = i.next();<a name="line.216"></a>
<span class="sourceLineNo">217</span>            for (TypeToken&lt;?&gt; supertype2 : supertypes) {<a name="line.217"></a>
<span class="sourceLineNo">218</span>                if (supertype2 != supertype &amp;&amp; supertype.isAssignableFrom(supertype2)) {<a name="line.218"></a>
<span class="sourceLineNo">219</span>                    i.remove();<a name="line.219"></a>
<span class="sourceLineNo">220</span>                    break;<a name="line.220"></a>
<span class="sourceLineNo">221</span>                }<a name="line.221"></a>
<span class="sourceLineNo">222</span>            }<a name="line.222"></a>
<span class="sourceLineNo">223</span>        }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>        // Pick the best candidate that's not Object, if possible<a name="line.225"></a>
<span class="sourceLineNo">226</span>        final TypeToken&lt;Object&gt; objectType = TypeToken.of(Object.class);<a name="line.226"></a>
<span class="sourceLineNo">227</span>        supertypes.remove(objectType);<a name="line.227"></a>
<span class="sourceLineNo">228</span>        switch (supertypes.size()) {<a name="line.228"></a>
<span class="sourceLineNo">229</span>        case 0:<a name="line.229"></a>
<span class="sourceLineNo">230</span>            return objectType;<a name="line.230"></a>
<span class="sourceLineNo">231</span>        case 1:<a name="line.231"></a>
<span class="sourceLineNo">232</span>            return supertypes.iterator().next();<a name="line.232"></a>
<span class="sourceLineNo">233</span>        default:<a name="line.233"></a>
<span class="sourceLineNo">234</span>            break;<a name="line.234"></a>
<span class="sourceLineNo">235</span>        }<a name="line.235"></a>
<span class="sourceLineNo">236</span><a name="line.236"></a>
<span class="sourceLineNo">237</span>        // Pick the one that's not an interface, if any (it will be the the only non-interface type)<a name="line.237"></a>
<span class="sourceLineNo">238</span>        for (TypeToken&lt;?&gt; supertype : supertypes) {<a name="line.238"></a>
<span class="sourceLineNo">239</span>            if (!supertype.getRawType().isInterface())<a name="line.239"></a>
<span class="sourceLineNo">240</span>                return supertype;<a name="line.240"></a>
<span class="sourceLineNo">241</span>        }<a name="line.241"></a>
<span class="sourceLineNo">242</span><a name="line.242"></a>
<span class="sourceLineNo">243</span>        // There are now only interfaces to choose from (or Object)... try JObject<a name="line.243"></a>
<span class="sourceLineNo">244</span>        final TypeToken&lt;JObject&gt; jobjectType = TypeToken.of(JObject.class);<a name="line.244"></a>
<span class="sourceLineNo">245</span>        if (supertypes.contains(jobjectType))<a name="line.245"></a>
<span class="sourceLineNo">246</span>            return jobjectType;<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span>        // Last resort is Object<a name="line.248"></a>
<span class="sourceLineNo">249</span>        return objectType;<a name="line.249"></a>
<span class="sourceLineNo">250</span>    }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>    @SuppressWarnings("unchecked")<a name="line.252"></a>
<span class="sourceLineNo">253</span>    private static &lt;T&gt; void addSupertypes(Set&lt;TypeToken&lt;?&gt;&gt; types, TypeToken&lt;T&gt; type) {<a name="line.253"></a>
<span class="sourceLineNo">254</span>        if (type == null || !types.add(type))<a name="line.254"></a>
<span class="sourceLineNo">255</span>            return;<a name="line.255"></a>
<span class="sourceLineNo">256</span>        final Class&lt;? super T&gt; rawType = type.getRawType();<a name="line.256"></a>
<span class="sourceLineNo">257</span>        types.add(TypeToken.of(rawType));<a name="line.257"></a>
<span class="sourceLineNo">258</span>        types.add(Util.getWildcardedType(rawType));<a name="line.258"></a>
<span class="sourceLineNo">259</span>        final Class&lt;? super T&gt; superclass = rawType.getSuperclass();<a name="line.259"></a>
<span class="sourceLineNo">260</span>        if (superclass != null) {<a name="line.260"></a>
<span class="sourceLineNo">261</span>            Util.addSupertypes(types, TypeToken.of(superclass));<a name="line.261"></a>
<span class="sourceLineNo">262</span>            Util.addSupertypes(types, type.getSupertype(superclass));<a name="line.262"></a>
<span class="sourceLineNo">263</span>        }<a name="line.263"></a>
<span class="sourceLineNo">264</span>        for (Class&lt;?&gt; iface : rawType.getInterfaces())<a name="line.264"></a>
<span class="sourceLineNo">265</span>            Util.addSupertypes(types, type.getSupertype((Class&lt;? super T&gt;)iface));<a name="line.265"></a>
<span class="sourceLineNo">266</span>    }<a name="line.266"></a>
<span class="sourceLineNo">267</span><a name="line.267"></a>
<span class="sourceLineNo">268</span>    /**<a name="line.268"></a>
<span class="sourceLineNo">269</span>     * Parameterize the raw type with wildcards.<a name="line.269"></a>
<span class="sourceLineNo">270</span>     *<a name="line.270"></a>
<span class="sourceLineNo">271</span>     * @param type raw type<a name="line.271"></a>
<span class="sourceLineNo">272</span>     * @param &lt;T&gt; raw type<a name="line.272"></a>
<span class="sourceLineNo">273</span>     * @return {@code type} genericized with wildcards<a name="line.273"></a>
<span class="sourceLineNo">274</span>     */<a name="line.274"></a>
<span class="sourceLineNo">275</span>    public static &lt;T&gt; TypeToken&lt;? extends T&gt; getWildcardedType(Class&lt;T&gt; type) {<a name="line.275"></a>
<span class="sourceLineNo">276</span>        if (type == null)<a name="line.276"></a>
<span class="sourceLineNo">277</span>            throw new IllegalArgumentException("null type");<a name="line.277"></a>
<span class="sourceLineNo">278</span>        final TypeVariable&lt;Class&lt;T&gt;&gt;[] typeVariables = type.getTypeParameters();<a name="line.278"></a>
<span class="sourceLineNo">279</span>        if (typeVariables.length == 0)<a name="line.279"></a>
<span class="sourceLineNo">280</span>            return TypeToken.of(type);<a name="line.280"></a>
<span class="sourceLineNo">281</span>        final WildcardType[] questionMarks = new WildcardType[typeVariables.length];<a name="line.281"></a>
<span class="sourceLineNo">282</span>        Arrays.fill(questionMarks, QUESTION_MARK);<a name="line.282"></a>
<span class="sourceLineNo">283</span>        return Util.newParameterizedType(type, questionMarks);<a name="line.283"></a>
<span class="sourceLineNo">284</span>    }<a name="line.284"></a>
<span class="sourceLineNo">285</span><a name="line.285"></a>
<span class="sourceLineNo">286</span>    /**<a name="line.286"></a>
<span class="sourceLineNo">287</span>     * Get the n'th generic type parameter.<a name="line.287"></a>
<span class="sourceLineNo">288</span>     *<a name="line.288"></a>
<span class="sourceLineNo">289</span>     * @param type parameterized generic type<a name="line.289"></a>
<span class="sourceLineNo">290</span>     * @param index type parameter index (zero based)<a name="line.290"></a>
<span class="sourceLineNo">291</span>     * @return type parameter at {@code index}<a name="line.291"></a>
<span class="sourceLineNo">292</span>     * @throws IllegalArgumentException if {@code type} is not a parameterized type with more than {@code index} type variables<a name="line.292"></a>
<span class="sourceLineNo">293</span>     */<a name="line.293"></a>
<span class="sourceLineNo">294</span>    public static Type getTypeParameter(Type type, int index) {<a name="line.294"></a>
<span class="sourceLineNo">295</span>        if (!(type instanceof ParameterizedType))<a name="line.295"></a>
<span class="sourceLineNo">296</span>            throw new IllegalArgumentException("type is missing generic type parameter(s)");<a name="line.296"></a>
<span class="sourceLineNo">297</span>        final ParameterizedType parameterizedType = (ParameterizedType)type;<a name="line.297"></a>
<span class="sourceLineNo">298</span>        final Type[] parameters = parameterizedType.getActualTypeArguments();<a name="line.298"></a>
<span class="sourceLineNo">299</span>        if (index &gt;= parameters.length)<a name="line.299"></a>
<span class="sourceLineNo">300</span>            throw new IllegalArgumentException("type is missing generic type parameter(s)");<a name="line.300"></a>
<span class="sourceLineNo">301</span>        return parameters[index];<a name="line.301"></a>
<span class="sourceLineNo">302</span>    }<a name="line.302"></a>
<span class="sourceLineNo">303</span><a name="line.303"></a>
<span class="sourceLineNo">304</span>    /**<a name="line.304"></a>
<span class="sourceLineNo">305</span>     * Invoke method via reflection and re-throw any checked exception wrapped in an {@link JSimpleDBException}.<a name="line.305"></a>
<span class="sourceLineNo">306</span>     *<a name="line.306"></a>
<span class="sourceLineNo">307</span>     * @param method method to invoke<a name="line.307"></a>
<span class="sourceLineNo">308</span>     * @param target instance, or null if method is static<a name="line.308"></a>
<span class="sourceLineNo">309</span>     * @param params method parameters<a name="line.309"></a>
<span class="sourceLineNo">310</span>     * @return method return value<a name="line.310"></a>
<span class="sourceLineNo">311</span>     */<a name="line.311"></a>
<span class="sourceLineNo">312</span>    public static Object invoke(Method method, Object target, Object... params) {<a name="line.312"></a>
<span class="sourceLineNo">313</span>        try {<a name="line.313"></a>
<span class="sourceLineNo">314</span>            return method.invoke(target, params);<a name="line.314"></a>
<span class="sourceLineNo">315</span>        } catch (InvocationTargetException e) {<a name="line.315"></a>
<span class="sourceLineNo">316</span>            if (e.getCause() instanceof Error)<a name="line.316"></a>
<span class="sourceLineNo">317</span>                throw (Error)e.getCause();<a name="line.317"></a>
<span class="sourceLineNo">318</span>            if (e.getCause() instanceof RuntimeException)<a name="line.318"></a>
<span class="sourceLineNo">319</span>                throw (RuntimeException)e.getCause();<a name="line.319"></a>
<span class="sourceLineNo">320</span>            throw new JSimpleDBException("unexpected error invoking method " + method + " on " + target, e);<a name="line.320"></a>
<span class="sourceLineNo">321</span>        } catch (Error e) {<a name="line.321"></a>
<span class="sourceLineNo">322</span>            throw e;<a name="line.322"></a>
<span class="sourceLineNo">323</span>        } catch (RuntimeException e) {<a name="line.323"></a>
<span class="sourceLineNo">324</span>            throw e;<a name="line.324"></a>
<span class="sourceLineNo">325</span>        } catch (Exception e) {<a name="line.325"></a>
<span class="sourceLineNo">326</span>            throw new JSimpleDBException("unexpected error invoking method " + method + " on " + target, e);<a name="line.326"></a>
<span class="sourceLineNo">327</span>        }<a name="line.327"></a>
<span class="sourceLineNo">328</span>    }<a name="line.328"></a>
<span class="sourceLineNo">329</span><a name="line.329"></a>
<span class="sourceLineNo">330</span>    /**<a name="line.330"></a>
<span class="sourceLineNo">331</span>     * Convert a raw class back into its generic type using caller-supplied type parameters.<a name="line.331"></a>
<span class="sourceLineNo">332</span>     *<a name="line.332"></a>
<span class="sourceLineNo">333</span>     * @param target raw class<a name="line.333"></a>
<span class="sourceLineNo">334</span>     * @param params type parameters<a name="line.334"></a>
<span class="sourceLineNo">335</span>     * @param &lt;T&gt; raw class type<a name="line.335"></a>
<span class="sourceLineNo">336</span>     * @return generic {@link TypeToken} for {@code target}<a name="line.336"></a>
<span class="sourceLineNo">337</span>     * @see &lt;a href="https://github.com/google/guava/issues/1645"&gt;Guava Issue #1645&lt;/a&gt;<a name="line.337"></a>
<span class="sourceLineNo">338</span>     */<a name="line.338"></a>
<span class="sourceLineNo">339</span>    @SuppressWarnings("unchecked")<a name="line.339"></a>
<span class="sourceLineNo">340</span>    public static &lt;T&gt; TypeToken&lt;? extends T&gt; newParameterizedType(Class&lt;T&gt; target, Type[] params) {<a name="line.340"></a>
<span class="sourceLineNo">341</span>        Type type;<a name="line.341"></a>
<span class="sourceLineNo">342</span>        try {<a name="line.342"></a>
<span class="sourceLineNo">343</span>            if (Util.newParameterizedTypeMethod == null) {<a name="line.343"></a>
<span class="sourceLineNo">344</span>                Util.newParameterizedTypeMethod = Class.forName("com.google.common.reflect.Types",<a name="line.344"></a>
<span class="sourceLineNo">345</span>                  false, Thread.currentThread().getContextClassLoader()).getDeclaredMethod(<a name="line.345"></a>
<span class="sourceLineNo">346</span>                  "newParameterizedType", Class.class, Type[].class);<a name="line.346"></a>
<span class="sourceLineNo">347</span>                Util.newParameterizedTypeMethod.setAccessible(true);<a name="line.347"></a>
<span class="sourceLineNo">348</span>            }<a name="line.348"></a>
<span class="sourceLineNo">349</span>            type = (Type)Util.newParameterizedTypeMethod.invoke(null, target, params);<a name="line.349"></a>
<span class="sourceLineNo">350</span>        } catch (RuntimeException e) {<a name="line.350"></a>
<span class="sourceLineNo">351</span>            throw e;<a name="line.351"></a>
<span class="sourceLineNo">352</span>        } catch (Exception e) {<a name="line.352"></a>
<span class="sourceLineNo">353</span>            throw new RuntimeException("unexpected exception", e);<a name="line.353"></a>
<span class="sourceLineNo">354</span>        }<a name="line.354"></a>
<span class="sourceLineNo">355</span>        return (TypeToken&lt;T&gt;)TypeToken.of(type);<a name="line.355"></a>
<span class="sourceLineNo">356</span>    }<a name="line.356"></a>
<span class="sourceLineNo">357</span>}<a name="line.357"></a>
<span class="sourceLineNo">358</span><a name="line.358"></a>




























































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